Improvement in tools for forming mouths of glass jars



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GOVENEUB M. KEEFFER, OF EAST BIRMINGHAM, PENNSYLVANIA', ASSIGNOR TO HIMSELB AND WILLIAM H. BARRY, OF SAME PLACE.

Letters Patent No. 110,243, dated December 20, 1870.

IMPROVEMENT IN TOOLS FOR FORMING MOUTHS OF GLASS JARS.

The Schedule referred lto in these Letters Patent and making part of the same.

To all whom. it may concern Beit known that I, Govnnnon M. KEEFFER, of the borough of East Birmingham, in the'county of Alle-- gheny and State of Pennsylvania, have invented a new and useful Improvement in Tool for Forming Months of Glass Jars; and I do hereby declare the following to be a full, clear, and exact description thereof, reference being had to the accompanying drawing making a part of this specification, and which is a side view of my improved tool for manufacturing` glass jars and other mouthed articles of glass-ware.

Like letters of reference indicate like parts in each.

To enable others skilled in the art to make and use my invention,'I will describe its construction and use.

In the drawinga` represents the plug of a tool for forming the mouths for glass jars. j

' Around the base of this plug a isa screw-thread,

l), for forming a thread onY the inside of the neck of the jarto be made.

Back of the thread, and rigidly attached tothe plug a, is a shoulder, c, for forming a seat for the gasket in the mouth of the jar.

Itigidly attached to the'baek of shoulder c is a plate, d, against which is Aformed the upper edge or end of the mouth of the jar.

The forming-plug or head thus described is rigidly fastened to a rod, c, the'end of which screws into or is otherwise secured to the back face of the plated.

The other endof the rod e, running back,enters a swivel-head, f.

Around this end of the rod c is a groove, s,- such I that, when the end of the rod c is inserted into the swivel-head f, a key, g, may be passed through thev swivel-head andlie in the groove s.

The end of the rod e is then secured in the swivelheadf in such a manner that, although it cannot be withdrawn without removing the key, yet it can turn freely therein.

The swivel-head f is, by means of a threaded rod, e', and two clamp-screws i i', connected with the back end of a bow, 7c, which is made of any suitable spring metal. y

The bow k has two arms,l l, extending forward, one along each side of the rod c, straight or bent, as

may be necessary, until their outer ends come oppo siterto screw-thread I) and shoulder c of the plug a.

To each of "these outer ends of the arms l is fastened a jaw, o, of such shape as may be desired in forming and linishing the outer edge and surface of the mouth of the jar, as hereafter is described.

The arms Z, l are made of some recilient metal, usually wrought-iron, so that they may be pressed in any required distance toward the forming-head, and will, when the pressure is removed, immediately spring out to their former position.'

At any desired point. in the arms l Z are two holes,

l l and l 1 in each of the arms directly opposite each other.

Through the first two of these holes Z l project the ends of a rod, m, which acts as a stop to limit the inward motion of the jaws o.

The rod m is wide at its middle point, where there is a hole through which passes the rod c.

At any desired point, and at relatively equal distancesfrom the main rod c, one ou each side, are two shoulders m' m. l Y

These vshoulders m m are to limit the inward inotion of the arms l l, for when the arms are pressed .in they come against theshoulders n1/fm and cannot advance farther.

Thus any size of jar may be made by changing the forming-head and the regulating-roden to the size required. 1 l

Below the regulating-rod m is another rod, n, whose ends project through the holes l" l". f

Through a hole in the center of this rod n the rod c passes.

At each side of the center, on the rod n, are two spiral springs, n n', the outer ends of which pr ess against the arms l l, and the inner ends against the shoulder, which is formed on -the rod n, by the widening of the rod, to allow the passage of the rod r` through it.

Then, when the jar is finished, and the pressure oiv the operators hand -removed from the arms l l, the springs u n Carry the formers'o back from contact with the neck of the jar.

In making the mouth of a jar (the latter being first heated to a pliable condition)ithe plug a isinserted 'into the jar until the end ofthe jar-mouth comes against the plate d. i

The operator grasps the arms Z and presses the foriners o o lightly against the outer face of the rim of the jar-mouth.

The jar, and with it the plug a and devices connected therewith, is then caused torevolve rapidly.

The formers o o not only press the outer face of the glass to the shape required, but also press it well in against the screw-thread b and shoulders c, so as to give, as if between two dies, the desired seat in the mouth of the jar for the gasket, and a screw-thread below for screwing in the lower end of a cup.

It will be noticed lthat the plate d is rigidly attached to and revolves with the forming-head.

This is a very useful feature of my invention,'since in the tools -heretpfbre in use for this purpose this plate does not turn but is stationary, and the end ol the jar revolving against it produces a great deal of friction, the effect of which upon the warm glass is to ncessary to remove it from the tool, the revolving is ,stopped by the thumb of the operator catching the stop-wheel h, when the rot-ation of either the jar or 'Y for forming'a like thread or inelnes in the mouth of the jar, and a shoulder, c, for making a seat in the month of the jar for the reception of a gasket, substantially as described. Y

2. The threaded plug a, with Aits shoulder c, in combinationwitll a plate, d, rigidl ,attached to such plug, and revolving therewith, substantially as described.

3. The threaded plug @with its shoulder c and plate d rigidly attached thereto and revolving therewith, incombination with the rode and swivel f, substantially as setforth.

In testimony whereof, I, the said GOVENEUR M. KEEFFER, have hereunto set my hand. J

" GOVENEUR M. KEEFFER.

Witnesses:

JOHN GLENN, G. H. CHRISTY. 

